settings.py

import datetime

from django.conf import settings
from django.core.signals import setting_changed

from rest_framework.settings import APISettings


USER_SETTINGS = getattr(settings, 'JWT_AUTH', None)

DEFAULTS = {
    'JWT_ENCODE_HANDLER':
    'rest_framework_jwt.utils.jwt_encode_handler',

    'JWT_DECODE_HANDLER':
    'rest_framework_jwt.utils.jwt_decode_handler',

    'JWT_PAYLOAD_HANDLER':
    'rest_framework_jwt.utils.jwt_payload_handler',

    'JWT_PAYLOAD_GET_USER_ID_HANDLER':
    'rest_framework_jwt.utils.jwt_get_user_id_from_payload_handler',

    'JWT_PRIVATE_KEY':
    None,

    'JWT_PUBLIC_KEY':
    None,

    'JWT_PUBLIC_KEY_USING_HEADER_HANDLER':
    None,

    'JWT_PAYLOAD_GET_USERNAME_HANDLER':
    'rest_framework_jwt.utils.jwt_get_username_from_payload_handler',

    'JWT_RESPONSE_PAYLOAD_HANDLER':
    'rest_framework_jwt.utils.jwt_response_payload_handler',

    'JWT_SECRET_KEY': settings.SECRET_KEY,
    'JWT_GET_USER_SECRET_KEY': None,
    'JWT_ALGORITHM': 'HS256',
    'JWT_VERIFY': True,
    'JWT_VERIFY_EXPIRATION': True,
    'JWT_LEEWAY': 0,
    'JWT_EXPIRATION_DELTA': datetime.timedelta(seconds=300),
    'JWT_AUDIENCE': None,
    'JWT_ISSUER': None,

    'JWT_ALLOW_REFRESH': False,
    'JWT_REFRESH_EXPIRATION_DELTA': datetime.timedelta(days=7),

    'JWT_AUTH_HEADER_PREFIX': 'JWT',
    'JWT_AUTH_COOKIE': None,
}

# List of settings that may be in string import notation.
IMPORT_STRINGS = (
    'JWT_ENCODE_HANDLER',
    'JWT_DECODE_HANDLER',
    'JWT_PAYLOAD_HANDLER',
    'JWT_PUBLIC_KEY_USING_HEADER_HANDLER',
    'JWT_PAYLOAD_GET_USER_ID_HANDLER',
    'JWT_PAYLOAD_GET_USERNAME_HANDLER',
    'JWT_RESPONSE_PAYLOAD_HANDLER',
    'JWT_GET_USER_SECRET_KEY',
)

class JWTAPISettings(APISettings):
    # we need to override the `user_settings` as calling reload would otherwise load the
    # `settings.REST_FRAMEWORK` into the JWT settings!

    @property
    def user_settings(self):
        if not hasattr(self, '_user_settings'):
            self._user_settings = getattr(settings, 'JWT_AUTH', {})
        return self._user_settings


api_settings = JWTAPISettings(USER_SETTINGS, DEFAULTS, IMPORT_STRINGS)


def reload_api_settings(*args, **kwargs):
    setting = kwargs['setting']
    if setting == 'JWT_AUTH':
        api_settings.reload()


setting_changed.connect(reload_api_settings)